Réorganisation des réseaux hydrographiques dans les modèles d'évolution des paysages, à grandes échelles spatiales et temporelles : Étude des captures potentielles de la Meuse

Abstract : Landforms result from interaction between several processes, involving complex coupling: climate, tectonics, erosion, human impact, etc. In landscapes dominated by fluvial erosion, terrain morphology is closely related to the hydrographic network system. Because the latter plays an important role in the surface processes coupling (fluvial processes and hillslope processes). Many evidences of stream piracies causing reorganization of hydrographic network suggest that the drainage system is changing, and it is far from being fixe as propose some numerical landscape evolution models. Nevertheless, works focusing on causes and mechanisms of these reorganizations are very few and they are largely qualitative. The aim of this thesis is to quantify and describe the reorganization of hydrographic networks provoked by headward piracy mechanism in the case of relative lowering between two basins, where the riverhead progress by headward erosion causing the diversion of a river flowing nearby. The problem is tackled with a numerical modeling approach. We emphasis on the evolution of the hydrographic networks of the French part of the Meuse basin, where several piracies were recorded in the past (the piracy of the Upper-Moselle by the Meurthe and the piracy of the Aire by the Aisne), and which current characteristics are favorable to new piracies (the Meuse river bed is perched at more than 50m comparing to its surrounding valleys (the Meuse river bed is perched at more than 50m comparing to its surrounding valleys: Marne at the west and the Moselle at the east).
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Abed Benaïchouche. Réorganisation des réseaux hydrographiques dans les modèles d'évolution des paysages, à grandes échelles spatiales et temporelles : Étude des captures potentielles de la Meuse. Sciences de la Terre. Ecole Nationale Supérieure des Mines de Paris, 2013. Français. ⟨NNT : 2013ENMP0058⟩. ⟨pastel-00960350⟩

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